/*
 * Copyright (c) 2018. czmc All Rights Reserved.
 * Author: czmc
 * Email: zxc6355533@163.com
 * Encoding: UTF-8
 */

package top.stime21.myneighbours.api;





import java.io.UnsupportedEncodingException;

import orgs.apache.commonss.codec.binary.Base64;


/**
 * Base64Utils.java.
 * base64编码解码的实现
 * @author aoki
 * @since JDK 1.6
 * @see
 */
public class Base64Utils {
	private static char[] base64EncodeChars = new char[] { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',
			'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y',
			'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p',
			'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6',
			'7', '8', '9', '+', '/' };
	private static byte[] base64DecodeChars = new byte[] { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
			-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
			-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63, 52, 53, 54, 55, 56, 57,
			58, 59, 60, 61, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12,
			13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1, -1, 26, 27, 28,
			29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50,
			51, -1, -1, -1, -1, -1 };

	public static String encode(byte[] data) {
		        StringBuffer sb = new StringBuffer();
		        int len = data.length;  
		        int i = 0;  
		        int b1, b2, b3;  
		        while (i < len) {  
		            b1 = data[i++] & 0xff;  
		            if (i == len) {  
		                sb.append(base64EncodeChars[b1 >>> 2]);  
		                sb.append(base64EncodeChars[(b1 & 0x3) << 4]);  
		                sb.append("==");  
		                break;  
		            }  
		            b2 = data[i++] & 0xff;  
		            if (i == len) {  
		                sb.append(base64EncodeChars[b1 >>> 2]);  
		                sb.append(base64EncodeChars[((b1 & 0x03) << 4) | ((b2 & 0xf0) >>> 4)]);  
		                sb.append(base64EncodeChars[(b2 & 0x0f) << 2]);  
		                sb.append("=");  
		                break;  
		            }  
		            b3 = data[i++] & 0xff;  
		            sb.append(base64EncodeChars[b1 >>> 2]);  
		            sb.append(base64EncodeChars[((b1 & 0x03) << 4) | ((b2 & 0xf0) >>> 4)]);  
		            sb.append(base64EncodeChars[((b2 & 0x0f) << 2) | ((b3 & 0xc0) >>> 6)]);  
		            sb.append(base64EncodeChars[b3 & 0x3f]);  
		        }  
		        return sb.toString();  
		    }	
	//.getBytes("iso8859-1")
	public static String decode(String str) throws UnsupportedEncodingException {
		        StringBuffer sb = new StringBuffer();
		        byte[] data = str.getBytes("US-ASCII");  
		        int len = data.length;  
		        int i = 0;  
		        int b1, b2, b3, b4;  
		        while (i < len) {  
	             
		            do {  
		                b1 = base64DecodeChars[data[i++]];  
		            } while (i < len && b1 == -1);  
		            if (b1 == -1) break;  
		             
	            do {  
		                b2 = base64DecodeChars  
		                        [data[i++]];  
		            } while (i < len && b2 == -1);  
		            if (b2 == -1) break;  
		            sb.append((char) ((b1 << 2) | ((b2 & 0x30) >>> 4)));  
		             
		            do {  
		                b3 = data[i++];  
		                if (b3 == 61) return sb.toString();  
		               b3 = base64DecodeChars[b3];  
		            } while (i < len && b3 == -1);  
		            if (b3 == -1) break;  
		           sb.append((char) (((b2 & 0x0f) << 4) | ((b3 & 0x3c) >>> 2)));  
	             
		            do {  
		                b4 = data[i++];  
		                if (b4 == 61) return sb.toString();  
		                b4 = base64DecodeChars[b4];  
		            } while (i < len && b4 == -1);  
		            if (b4 == -1) break;  
		            sb.append((char) (((b3 & 0x03) << 6) | b4));  
		        }  
		        return sb.toString();  
		    }	
	
	/**
	 * 使用commons包中的base64加密方法
	 * @param input
	 * @return 返回base加密字符串
	 * @throws UnsupportedEncodingException
	 */
	public static String encodeBase64String(String input) throws UnsupportedEncodingException {
		return Base64.encodeBase64String(input.getBytes());
//		return Base64.encodeToString(input.getBytes(), android.util.Base64.DEFAULT);
	}
	
	/**
	 * 使用commons包中的base64解密方法
	 * @param input
	 * @return 返回解密后的字符串
	 * @throws UnsupportedEncodingException
	 */
	public static String decodeBase64String(String input) throws UnsupportedEncodingException {
		return new String(Base64.decodeBase64(input.getBytes()),"utf-8");
//		return new String(Base64.decode(input,Base64.DEFAULT),"utf-8");
	}
 
	
	/**
	 * test
	 * @param args
	 * @throws UnsupportedEncodingException
	 */
	public static void main(String[] args) {
		String s1 = "12";
		/*String s2 = "3";
		String s3 = "10001";*/
		String x1 = null;
		try {
			x1 = encodeBase64String(s1);
		} catch (UnsupportedEncodingException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	/*	String x2=encode(s2.getBytes());
	    String x3=encode(s3.getBytes());*/
//		System.out.println("s1:"+x1);
	/*	System.out.println("s2:"+x2);
		System.out.println("s3:"+x3);
		System.out.println("解密s1:"+decode(x1));
		System.out.println("解密s2:"+decode(x2));
		System.out.println("解密s3:"+decode(x3));*/
//		System.out.println("加密前：" + s);
//		String x = encode(s.getBytes());
//		System.out.println("加密后：" + x);
//		String x1 = new String(decode(x));
//		System.out.println("解密后：" + x1);
//		String x2 = new String(decode("MTExMTExMQ=="));
//		System.out.println("解密后：" + x2);
	}

}
